IGF1-Dependent Synaptic Plasticity of Mitral Cells in Olfactory Memory during Social Learning.

IGF1-Dependent Synaptic Plasticity of Mitral Cells in Olfactory Memory during Social Learning.
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社会学习过程中嗅觉记忆中二尖瓣细胞 IGF1 依赖性突触可塑性

DOI:
10.1016/j.neuron.2017.06.015
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发表时间:
2017-07-05
期刊:
影响因子:
16.2
通讯作者:
Cao P
Cao P
中科院分区:
医学1区
文献类型:
--
作者:
Liu Z;Chen Z;Shang C;Yan F;Shi Y;Zhang J;Qu B;Han H;Wang Y;Li D;Südhof TC;Cao P

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在食物偏好的社会传递(STFP)过程中,小鼠对社会伙伴呈现的食物气味形成长期记忆。大脑是如何将社会环境与气味信号联系起来以促进记忆编码的?本研究表明,在STFP期间,气味暴露(而非无条件气味暴露)可选择性地诱导嗅球颗粒细胞和二尖瓣细胞树突突触gaba能成分的突触强度的肾小球特异性长期增强(LTP)。条件缺失synaptotagmin-10,二尖瓣细胞分泌igf1的Ca2+传感器,或嗅球中igf1受体的缺失,阻止了STFP后社会相关的gaba能LTP和受损的记忆形成。相反,将IGF1添加到急性嗅球切片中,通过增强突触后gaba受体反应,诱导二尖瓣细胞的gaba能LTP。因此,我们的数据揭示了社会条件长期记忆的突触基质,它在感觉信息的初始处理水平上运作。Liu等人证明,小鼠社交学习在嗅球gaba能G-M突触诱发肾小球特异性LTP,揭示了在感觉信息加工水平上运作的社会条件长期记忆的突触底物。
During social transmission of food preference (STFP), mice form long-term memory of food odors presented by a social partner. How does the brain associate a social context with odor signals to promote memory encoding? Here, we show that odor exposure during STFP, but not unconditioned odor exposure, induces glomerulus-specific long-term potentiation (LTP) of synaptic strength selectively at the GABAergic component of dendrodendritic synapses of granule and mitral cells in the olfactory bulb. Conditional deletion of synaptotagmin-10, the Ca2+-sensor for IGF1-secretion from mitral cells, or deletion of IGF1-receptor in the olfactory bulb prevented the socially relevant GABAergic LTP and impaired memory formation after STFP. Conversely, addition of IGF1 to acute olfactory bulb slices elicited the GABAergic LTP in mitral cells by enhancing postsynaptic GABA-receptor responses. Thus, our data reveal a synaptic substrate for a socially conditioned long-term memory that operates at the level of the initial processing of sensory information. Liu et al. demonstrate that mouse social learning induces a glomerulus-specific LTP at GABAergic G-M synapse in the olfactory bulb, revealing a synaptic substrate for a socially conditioned long-term memory that operates at the level of sensory information processing.
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